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Electronics 2015, 4(4), 847-856; doi:10.3390/electronics4040847

Enhanced Visibility of MoS2, MoSe2, WSe2 and Black-Phosphorus: Making Optical Identification of 2D Semiconductors Easier

1
Dpto. de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
2
Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
3
Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-nanociencia), Campus de Cantoblanco, E-18049 Madrid, Spain
4
Institute of Physics, University of Münster, D-48149 Münster, Germany
5
Center for Nanotechnology, University of Münster, D-48149 Münster, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Frank Schwierz
Received: 14 September 2015 / Revised: 13 October 2015 / Accepted: 21 October 2015 / Published: 28 October 2015
(This article belongs to the Special Issue Two-Dimensional Electronics - Prospects and Challenges)
View Full-Text   |   Download PDF [3529 KB, uploaded 28 October 2015]   |  

Abstract

We explore the use of Si3N4/Si substrates as a substitute of the standard SiO2/Si substrates employed nowadays to fabricate nanodevices based on 2D materials. We systematically study the visibility of several 2D semiconducting materials that are attracting a great deal of interest in nanoelectronics and optoelectronics: MoS2, MoSe2, WSe2 and black-phosphorus. We find that the use of Si3N4/Si substrates provides an increase of the optical contrast up to a 50%–100% and also the maximum contrast shifts towards wavelength values optimal for human eye detection, making optical identification of 2D semiconductors easier. View Full-Text
Keywords: two-dimensional semiconductors; optical identification; silicon nitride substrate; molybdenum disulfide (MoS2); molybdenum diselenide (MoSe2); tungsten diselenide (WSe2); black phosphorus two-dimensional semiconductors; optical identification; silicon nitride substrate; molybdenum disulfide (MoS2); molybdenum diselenide (MoSe2); tungsten diselenide (WSe2); black phosphorus
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rubio-Bollinger, G.; Guerrero, R.; de Lara, D.P.; Quereda, J.; Vaquero-Garzon, L.; Agraït, N.; Bratschitsch, R.; Castellanos-Gomez, A. Enhanced Visibility of MoS2, MoSe2, WSe2 and Black-Phosphorus: Making Optical Identification of 2D Semiconductors Easier. Electronics 2015, 4, 847-856.

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